PDA

View Full Version : without 4,10's ??? your missing a great power


Dave B.
11-17-2005, 12:23 AM
As you all know I went from 3,55's to 4,10's then to 3,73's and I just today went back to 4,10's and I tell you all,,,,,,,,,these cars were mente to run 4,10's as its such a night and day change,

what power it has with 4,10's man!!! if you have not tried them, I cannot recommend another mod until you have.

I bet it would take 50 plus HP and 50 Lbs TQ to make a 3,55 gear feel like 4,10's do

InfamousSVT
11-17-2005, 01:07 AM
I was going to go with 4:10's when I did my solid axle, but I went with the 3.73's instead. For now it's good enough for me. If I ever have to take the rear end out again I will more than likely go with the 4.10 gears...................I may end up getting a Carbon Fiber Drive shaft later on down the road as well :thumbsup:

Dave B.
11-17-2005, 01:13 AM
if your making any HP at all and you go to 4:10's that will bring the threshold down where your drive shaft if its screwed up like mine was you will have vibrations, then you will have go with a carbon shaft to solve the vibration issue that right now you will not notice unless you go out and drive over a hundred or more,

the 373 are nothing like 410's,,,not even close

smashedheadcat
11-17-2005, 09:29 AM
I'm not missing out on the power from the 4.10's. *cough* 4.30's here *cough* LOL. I'm switching them out though. But I will say that it definately has some serious pull with gears in it.

Dave B.
11-17-2005, 08:33 PM
4:30's UH????? Dang!!!!! your Cyropractor must love you,,,,,
I know with these 4:10's the pull is so incredible,,,,the other thing I wanted to tell you all is today was the very first time I had to test to see if I was going to get vibrations with the 4:10 gears back in a 80 MPH and up.

its fine, I can run right on up to 130 MPH with absolutly no drive shaft vibration,,,,,Viva the Carbon shaft

cobrabitn
11-17-2005, 10:44 PM
The best all around gear for these cars is a 4:10. As stated previously, you would not feel a big difference between a 3.90 and a 3.73 like you would a 4.10. JMHO! :rolleyes:

Dave B.
11-17-2005, 11:07 PM
knowing how much better the 03-04's run all the way around with 4:10's
do those of you folks in the know think Ford used 3:55's mainly for fuel economy? Noise? or why?

I can tell you right not that my car will get to its max top end better with 4:10's in it than it would have with 3:55's,,,,,,So the idea Ford wanted to keep the RPM down for all those German Autobahn drivers is not going to hold up, it makes no sence in a way, it must be for fuel economy because with the 470 HP in combination with 4:10's my car absolutly rocks right up thru every gear and does not struggle at all and still climbing
as it went thru 135 MPH before I chickened out, but it would have kept going no problem, and I just had 3:73's two days ago and I can promiss you it would not have kept pulling thru a buck thirty five at the rate it was climbing today,

Was it on this board when someone did some math and calculated these cars with stock gearing,,that if one had enough HP the 3:55's would take it to 202 MPH before red lining in sixth gear??? I heard that somewhere,,,anyone else hear that??

blk04cobra1
11-18-2005, 08:10 AM
Ive heard they pull through 4th, but quickly run out of gear after that...Ive ridden in a GT with 4.10's and it made it feel a lot more powerful, but a quick highway run with a SRT-4 shut him up real quick b/c he ran out of gear :thumbsup: ...glad your luck's turning around a little, pass some this way :D

RF Cobra
11-18-2005, 09:53 AM
Sounds like the 4.10s give a good kick and do a great job of transferring the power to the rear wheels.

My only concerns are a minor one: that the gear maxes you out too quickly thus reducing top speed (even if I was never able to try to go that fast) and what I consider to be a major concern: How do you keep tires on it for any length of time? I find it too easy to loose traction and spin the back wheels as it is and only got just under 9k miles out of the stock tires. The Khumos I replaced them with seem to be doing better but still loose traction at times and I hope to go to 315s next time around.

Now I know my car is still stock so your extra power will up your top speed. However, is the tire problem common, or is it more the driver trying to get used to the car since other than our dump truck the only other manual cars I had driven were way down on power compared to this one (Escort & Subaru)?

kilroy
11-18-2005, 04:11 PM
On the street I have zero traction with 3.55s in 1rst & 2nd as it is... Without stickies on steeper gears I'd be an easy mark for just about anything :D

Dave B.
11-18-2005, 10:32 PM
the concerns about the 4:10's working well then maxing out on a Cobra is not true,

Guess it was an issue on a GT but not on a Cobra, with the 4:10's I pull strong on the interstate all the way up,

Its kind of funny because in sixth gear, with 3:55's right at 80 MPH my RPM was like 2350 and with 4:10's its only around 2700 RPM at 80 MPH. thats only 350 RPM more for all that extra pull, and I can tell you now that with 4:10's its still pulling strong in 5th gear as speed increases,,,,,,and man is that Carbon shaft sweet and steady even at a buck thirty five,,,soon as I can find a safe place im going to see how fast it will go,,

Has anyone ever gone real fast?? hit me with some real numbers and RPM's

kilroy
11-19-2005, 10:26 PM
The drop of a few mpg isn't an issue for most, nor is the decreased top end (who drives 170+ ?). Smokin' the hides at the drop of the hat isn't always fun when a Honda is strollin' on by. It's nice to have the power - I'd rather put what I make to the ground. If I had 4.10s I'd lose third on the street, too.

Dave B.
11-20-2005, 01:32 AM
Kilroy, is what your saying, that the HP your making now, is so much that your spinning tires now with 3,55's in first and maybe second, and if you went to 4,10's you would not only spin tires in those gears but also third too?

how much HP are you putting to the rear wheels now that you have this unfortuate problem?

kilroy
11-20-2005, 05:30 AM
Kilroy, is what your saying, that the HP your making now, is so much that your spinning tires now with 3,55's in first and maybe second, and if you went to 4,10's you would not only spin tires in those gears but also third too?Yes. :cool: no maybes about it.

how much HP are you putting to the rear wheels now that you have this unfortuate problem? ATS dyno was supposed to be ready for operation this week. Rick estimated ~600rwhp (on MD) based upon his car making 650rwhp with same tune +2psi, it's easily 550rwhp. I never had this problem with 475/497 it used to make with the heaton.

My car by no means is king kong, but if i do anything other than roll into it - she's up in smoke.

Big Daddy
11-20-2005, 11:53 AM
Kilroy,

I know what you mean. I run 3.73's and I think they are too much gear for my HP level. I can smoke the tires in first second and third gears. It is fun at first but having to baby the car off the line so I don't sit in one spot and spin is NOT cool. I usually give up a car or two lengths off the start, thank God I have the power to make it up! :thumbsup:

Dave B.
11-20-2005, 07:11 PM
Geez,,,,you 600+ RWHP folks make me want to get divorced just so I can spend more money,,,yes I will certainly agree with the fact that 4:10's is are not going to work with that kind of juice,,,,

two great questions:

1. what cost more to install and set up right, KB/Whip? or
a geared turbo style Procharger type?

2. assuming the KB & whipple are close,,which STYLE CHARGER is best over all,,, A ROOTS?? or a GEARED TURBO (pro-charger type) for over all Horse power and Torque??

mkkrs1
11-20-2005, 08:40 PM
I guess you have your transmission problems fixed now. did you up grade the clutch or go back with a stock one from the dealer.

mike

89-718 convert.
03 cobra

Dave B.
11-20-2005, 09:08 PM
normaly I would have upgraded the whole clutch deal, but because there was a bulletin on the snout of the transmission, they were willing to warrantee the snout,clutch plate, throwout bearing,and the labor to change it all out,
I had to pay for a new flywheel,clutch disc,pilot bearing,and about 2 hours of extra labor because I had headers on the car that normaly they would not have had extra time to get the starter mototr off in order to get the bell off,

so I had to write a check for $1185 for that stuff, could you imagine what it would have cost me to also buy an after market clutch assymbly on top of what I already had to pay? it would have been about $2500 total because they were not happy about giving warrantee at all when they say all that stuff on my car,

ausie
11-21-2005, 12:24 PM
the concerns about the 4:10's working well then maxing out on a Cobra is not true,

Guess it was an issue on a GT but not on a Cobra, with the 4:10's I pull strong on the interstate all the way up,

Its kind of funny because in sixth gear, with 3:55's right at 80 MPH my RPM was like 2350 and with 4:10's its only around 2700 RPM at 80 MPH. thats only 350 RPM more for all that extra pull, and I can tell you now that with 4:10's its still pulling strong in 5th gear as speed increases,,,,,,and man is that Carbon shaft sweet and steady even at a buck thirty five,,,soon as I can find a safe place im going to see how fast it will go,,

Has anyone ever gone real fast?? hit me with some real numbers and RPM's
I know I have gone beyond 160 in my stock 04. I do not recall if I was in 4th or if I shifted to 5th gear at that time. I was racing a GTO and at speeds of 130 I could not seem to loose him/her so I decided to go for it. As for RPM I did not even look at it since everything was moving so fast. I only got a glimps of the speedo after I dusted the GTO by almost a quarter mile when I noticed the needle was below the 160 mark by at least the distance of 10 miles on the scale and had to immediately slow down to aviod hitting the traffic in front of me which was closing in like stationary objects. I could only imagine how it would have been with 4.10 in the rear since I only have the stock 3.55's. That was probably the fastest I have ever driven a land vehicle. Since I do not have a pilots licence I will be grounded.